The ATN shall either use International Organization for Standardization (ISO) communication standards for open systems interconnection (OSI) or use the Internet Society (ISOC) communications standards for the Internet Protocol Suite (IPS).
-The AFTN/AMHS gateway shall ensure the interoperability of AFTN and CIDIN stations and networks with the ATN.
-An authorized path(s) shall be defined on the basis of a predefined routing policy.
-The ATN shall transmit, relay and deliver messages in accordance with the priority classifications and without discrimination or undue delay.